Geissele Automatics Barrel Features The Geissele Barrel is cold hammer forged from chrome moly vanadium steel a manufacturing process that compresses the grain structure of the steel for superior durability and heat resistance under sustained fire. Each barrel is chrome lined to resist wear and corrosion in the bore extending service life well beyond a standard barrel. A 1 in 7 twist rate stabilizes the full range of 5.56 NATO loads from lightweight varmint bullets to heavier long-range projectiles giving shooters versatility across ammunition types. M4 feed ramps ensure reliable feeding from the magazine into the chamber a detail that matters under rapid fire. Built with a Geissele Taper Profile and mid-length gas system this 16 barrel balances weight forward of the receiver while timing gas pressure for smoother softer cycling than a carbine-length system. The .750 gas block diameter and .078 gas port are matched to the gas system for reliable function across a range of ammunition pressures. A 1/2x28 threaded muzzle accepts standard compensators flash hiders and suppressors for further customization. Every barrel is High Pressure Tested and Magnetic Particle Inspected at Geissele s North Wales Pennsylvania facility giving shooters a barrel ready for duty use competition or a dedicated range gun. Geissele Automatics Barrel Specifications Manufacturer: Geissele Automatics Model: Barrel Caliber: 5.56 NATO Barrel Length: 16 Type of Barrel: Cold Hammer Forged Chrome Lined Thread Pitch: 1/2x28 Gas System: Mid-Length Finish: Manganese Phosphate Color: Black Compatible Hosts: AR-15 Available At: GrabAGun